That’s in contrast to comments from state-controlled Petroleos de Venezuela SA last month announcing a second expansion to take output to 230,000 barrels a day at the project, which is jointly owned by PDVSA and CNPC — China’s biggest energy company.

PDVSA declined to comment. A representative at the press office of CNPC didn’t answer two calls, or immediately reply to text messages seeking comment.

The halt is another blow for Venezuela, which is increasingly reliant on Russian and Chinese oil companies to prop up an industry struggling against an economic blockade by Donald Trump’s administration. Chevron Corp. and four U.S. oilfield service companies will stop work in the Latin American nation at the end of October unless sanctions waivers are extended, potentially affecting nearly half the drilling rigs operating in the country.

A project manager at HQC — as the Chinese contractor is known — said in a notification to Sinovensa it was owed more than $52 million in invoices dating back to 2018, and that it was suspending activities from Sept. 3. The JV is a key project in Venezuela’s Orinoco region that boasts the largest oil reserves on the planet and currently accounts for about half of the country’s remaining production.